Refractory Cement as anti-scaler

[David Eye]

I'll bet this has been discussed before but I can't seem to find any info.
I have been doing searches here (and elsewhere) regarding the use of standard store bought refractory cement as an anti-scale/decarb coating versus ATP641 or thinned out Satanite.
So far I have found nothing.....thus this thread.

I looked on the web for specs/ingredients of Satanite and ATP641 and couldn't find much either. Even an MSDS on these would be helpful....without paying for it!

I am wondering if the standard refractory cement/mortar that they sell in the big box stores could be thinned out with water to a thin slurry for knife blades. It is only rated to 2000F, but that would be fine for my usage on 1095.
The only ingredient MENTIONED on it for safety reasons is "sodium silicate".
Is this stuff similar to Satanite (that can be thinned) or is it a somewhat different compound?
I could just purchase some ATP641 for about $15+ shipping/pint, but I'm already spending a lot on other things making a kiln and obtaining other tools/equipment, supplies, etc.
I am attempting to save a few bucks where ever I can......the nickels and dimes are adding up too!
If I have to purchase some ATP641 I will.

Thanks, DAVID